CPC B21D 37/02 (2013.01) [B21D 5/02 (2013.01)] | 20 Claims |
1. A press brake comprising:
a die;
a punch opposing the die and including punch elements lined up in a longitudinal direction of the die, each punch element having a position controller and overload preventer associated with the position controller;
a punch support supporting the punch; and
a moving actuator configured to move the punch support relative to the die in an upper-lower direction;
wherein the position controllers are configured to adjust positions of the punch elements relative to the punch support in the upper-lower direction to change a shape of the punch, the shape is collection of the punch elements, each position controller including a screw and a holder threadingly engaged with the screw,
each overload preventer has a portion attached to and extending from an axial end of a respective one of the position controllers to allow movement of a respective one of the punch elements in the upper-lower direction in response to a load input to the respective punch element exceeding a set value, and
the position controllers are configured to individually adjust pressing forces applied to respective portions of a workpiece.
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